CN2773505Y - Microwave oven with continous adjustable power - Google Patents
Microwave oven with continous adjustable power Download PDFInfo
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- CN2773505Y CN2773505Y CNU2005200327753U CN200520032775U CN2773505Y CN 2773505 Y CN2773505 Y CN 2773505Y CN U2005200327753 U CNU2005200327753 U CN U2005200327753U CN 200520032775 U CN200520032775 U CN 200520032775U CN 2773505 Y CN2773505 Y CN 2773505Y
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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Abstract
In order to solve the defects that the prior art can not directly adjust continuous power or the methods to achieve the adjustment are complicated and unstable and have big interference, etc., the utility model discloses a microwave oven design proposal which utilizes convenient, stable and low cost methods to adjust continuously output power. The utility model adopts the method of connecting capacitors in parallel to adjust the total capacitance of a magnetron high-voltage power supply circuit in a microwave oven, so that continuously output microwave power can be adjusted under the precondition of not stopping a magnetron. Simultaneously, the utility model also improves high voltage relays used in the circuit to increase the voltage resisting value. The utility model has the main advantages of simply circuit, few component classes, low cost and continuous and stable output power.
Description
Technical field
The utility model relates to a kind of micro-wave oven, specifically, relates to a kind of micro-wave oven that can adjust the power of continuous output.
Background technology
In general household microwave oven, usually adopt half-wave voltage doubler for reducing cost, its circuit is as shown in Figure 1, its working method is: after connecting alternating current, boost through band Filament Winding high-tension transformer 1, to the electric capacity charging, do not work by magnetron by kenotron 3 for positive half cycle; Negative half period gives magnetron 4 power supplies by band Filament Winding high-tension transformer 1 high pressure winding and capacitor 2 series connection, capacitor 2 discharges this moment, magnetron 4 work, output microwave.
Usually, micro-wave oven provides a plurality of power shelves, is used to heat the food of variety classes or varying number.But because the restriction of above-mentioned low-cost circuit, existing on the market micro-wave oven can only reach the purpose of control micro-wave oven mean power by changing magnetron cycle conduction time.That is to say, the microwave power output that the different capacity shelves of existing on the market micro-wave oven are realized is not continuous, but control the ratio of full power output time and zero energy output (magnetron is not worked) time, thereby reach the purpose of regulating power indirectly by the switching of control magnetron working power.Such as, obtain 50% microwave power, just can control 5 seconds of magnetron work, stopped for 5 seconds, promptly the micro-wave oven mean power is 50%.Suitably control the ratio of magnetron working time and dwell time, just can obtain the mean power of other ratio.
Adopt this Poewr control method, in the time period of one-period, according to the adjusting requirement of power shelves, microwave full power output in a certain proportion of time, and all the other time microwave powers are zero.This has just caused some drawbacks in the actual use of micro-wave oven.Such as, adopt the thaw effect of frozen meat of the shelves that thaw of 30% power just bad, occur that some place of frozen meat has been boiled and situation that other places still do not thaw through regular meeting.Produce the reason of this phenomenon, usually being takeed for is that the microwave field uniformity is bad, and in fact, microwave power was excessive when main cause just was magnetron work.
Retrieval finds that application number is 97220907.7 the utility model patent that is called " continuous power adjustable microwave oven ", controls microwave power by triode restriction discharge current in micro-wave oven; Application number is 98123503.4 the utility model patent that is called " numerally controlled microwave oven with continuously adjustable power ", adopt the elementary input voltage of silicon control zero-cross pressure regulation, thereby the size that realizes microwave power is carried out continuous control zero to the total power scope with control magnetron cavity voltage transformer.The former weak point is: triode and support circuit had relatively high expectations, and the circuit complexity, components and parts are many, are unfavorable for marketing; And, when adjusting power, the triode portion conducting, capacitor part is discharged, thereby has adjusted the operating voltage and the power output of magnetron, but still have voltage on the capacitor, the magnetron power output is more little, and this voltage is just high more, when next charge cycle arrives, will produce bigger interference, thereby influence the stability of circuit.The latter's weak point is: electromagnetic interference is bigger; And, influence real work efficient because controllable silicon has voltage drop; The load of controllable silicon adjustment is the high-tension transformer of micro-wave oven, is an inductive load, controllable silicon is damaged, thereby make this circuit when adjusting to peak power output, less stable.
In view of the defective or the deficiency of prior art, present patent application is through after the several times tests, proposed the new micro-wave oven design that can adjust the power of continuous output.
The utility model content
The utility model is primarily aimed at the deficiencies in the prior art, with easy, stable, mode provides a kind of micro-wave oven design that can adjust the power of continuous output cheaply.
The microwave oven with continuously adjustable power that the utility model is designed, other micro-wave oven on the market is the same, still comprise shell, fire door, furnace chamber, electric control chamber, band Filament Winding high-tension transformer, kenotron, magnetron, the parts that micro-wave ovens such as high voltage source possess usually, it is characterized in that: in the circuit of magnetron high voltage source, the individual capacitor of n (n 〉=2) in parallel between band Filament Winding high-tension transformer and kenotron, one end of each capacitor link to each other with band Filament Winding high-tension transformer jointly (still connect and power) to magnetron by band Filament Winding high-tension transformer high pressure winding and capacitor, the other end is connected (corresponding to n capacitor with a high-voltage relay separately, n high-voltage relay also arranged in the circuit), n high-voltage relay links to each other with kenotron jointly; The opening and closing of the contact by controlling each high-voltage relay are controlled the duty that each high-voltage relay is distinguished corresponding capacitor, adjust the size of circuit total capacitance, thereby adjust microwave output power.Capacitance is little, and discharge time is short, and microwave power is just low; Capacitance is big, and discharge time is long, and microwave power is just big.
As previously mentioned, in micro-wave oven, power to magnetron by being with Filament Winding high-tension transformer high pressure winding and capacitor to connect, and need reaching 4000 volts, magnetron could produce microwave, the working method that the utility model adopts relay to connect with capacitor, so relay must bear higher voltage.And general miniature electro-magnetic relay, dielectric withstanding voltage is relatively poor, can not satisfy the high-voltage applications field, but its cost is low, is beneficial to apply.
Therefore, the utility model is improved miniature relay: except that parts such as the contact leading foot of general miniature electro-magnetic relay, base, coil, extension spring, shell, coil leading foot, one group of moving contact and static contact on relay, have been increased, have two groups of moving contacts and static contact, with these two groups of contact series connection, this just makes the withstand voltage distance of two static contacts increase by one times by the moving spring armature group; Length with the moving spring armature group is increased to 20～30mm simultaneously.Like this, when the coil two ends add certain voltage, pass through certain electric current in the coil, produce galvanomagnetic-effect, the armature group overcomes the pulling force that returns extension spring and inhales to iron core under the sucking action of electromagnetic force, when the moving contact of drive armature group and static contact adhesive, the distance between each group contact increases, thereby has improved the withstand voltage between contact.So when this relay was connected with capacitor, this relay just can bear the high voltage after transformer boosts.
For the even stepping of realizing that power is adjusted, the ratio of n capacitor volume in parallel is preferably in the circuit of magnetron high voltage source as previously mentioned: 1: 2: ... 2
N-1That is: three capacitor volume ratios are: 1: 2: 4; Four capacitor volume ratios are: 1: 2: 4: 8; By that analogy.Like this, the various combination of capacitor just can be realized the proportionate relationship of uniform circuit total capacitance, such as: three Capacity Ratio are the power stepping that 1: 2: 4 capacitor in theory just can be realized seven kinds of equal difference.
Theoretically, if the capacitance of each capacitor is different, particularly each capacitor volume is than being above-mentioned 1: 2: ... 2
N-1When concerning, n capacitor in parallel can realize 2 at most
N-1Individual power stepping, that is: three capacitors can have 7 shelves, and four capacitors can have 15 shelves, by that analogy.But, during daily micro-wave oven is used, usually do not need too many power stepping, therefore, when n=3, that is: in the circuit of magnetron high voltage source, three capacitors in parallel between band Filament Winding high-tension transformer and kenotron, one end of each capacitor links to each other with band Filament Winding high-tension transformer jointly, the other end respectively with three high-voltage relays in one connect, three high-voltage relays link to each other with kenotron jointly.Under the situation of these three capacitors, have the stepping that 7 power are adjusted, generally speaking just enough, certainly, in actual applications, can also be less than 7 steppings.
By above scheme, the utility model can reach purpose of design.The applicant carried out test of many times, and result of the test shows that the utility model is successful, effective, and is stable.The utility model adopts the method for shnt capacitor to adjust the circuit total capacitance, thereby the microwave power to continuous output is adjusted under the prerequisite that does not stop magnetron work.Compared with prior art, advantage of the present utility model and beneficial effect mainly are: circuit is simple, and the components and parts kind is few, and cost is low, and is effective, and stability is high.
Description of drawings
Fig. 1 is the schematic diagram of half-wave voltage doubler.
Fig. 2 is that the stepping of three capacitor parallel connections is adjusted the microwave power schematic diagram.
Fig. 3 is that the stepping of four capacitor parallel connections is adjusted the microwave power schematic diagram.
Fig. 4 is the front view of the high-voltage relay of connecting with capacitor.
Fig. 5 is the side view of the high-voltage relay of connecting with capacitor.
Number in the figure is as follows:
1 band Filament Winding high-tension transformer, 2 capacitors, 3 kenotrons
4 magnetrons, 5 capacitor A, 6 capacitor B
7 capacitor C, 8 high-voltage relay A, 9 high-voltage relay B
10 high-voltage relay C, 11 capacitor D, 12 high-voltage relay D
The static contact 15 moving spring armature groups of moving contact 14 high-voltage relays of 13 high-voltage relays
The specific embodiment
Below in conjunction with accompanying drawing, further describe the specific embodiment of the present utility model.
Embodiment one
In the circuit of the magnetron high voltage source of micro-wave oven, three capacitors in parallel between band Filament Winding high-tension transformer 1 and kenotron 3, be respectively capacitor A5, capacitor B6, capacitor C7, one end of each capacitor links to each other with band Filament Winding high-tension transformer 1 jointly, the other end is connected with high-voltage relay A8, high-voltage relay B9, high-voltage relay C10 respectively, and three high-voltage relays link to each other with kenotron 3 jointly.Each high-voltage relay all has two groups of moving contacts 13 and static contact 14, by moving spring armature group 15 two groups of contacts is connected; Length with moving spring armature group 15 is increased to 20mm simultaneously.The opening and closing of the contact by controlling each high-voltage relay are adjusted the size of circuit total capacitance, thereby adjust microwave output power.
The capacity of capacitor A5 is 0.2 μ F, and the capacity of capacitor B6 is 0.35 μ F, and the capacity of capacitor C7 is 0.65 μ F, and the transformer efficiency of micro-wave oven is 750W.By the various combination of these three capacitors, can obtain seven kinds of microwave powers, seven power shelves can be provided.Through actual test, the microwave power of respective electrical container situation in parallel, output is as shown in the table when selecting the different capacity shelves:
| The power shelves | Capacitor | Microwave power (W) |
| One | A | 119 |
| Two | B | 236 |
| Three | A∥B | 387 |
| Four | C | 480 |
| Five | A∥C | 606 |
| Six | B∥C | 684 |
| Seven | A∥B∥C | 783 |
Annotate: A ∥ C represents: capacitor A and capacitor C parallel connection, by that analogy.
When selecting power shelves, high-voltage relay B9, high-voltage relay C10 disconnect, and high-voltage relay A8 closure is only connected capacitor A5, and this moment, microwave output power was 119W;
When selecting two power shelves, high-voltage relay A8, high-voltage relay C10 disconnect, and high-voltage relay B9 closure is only connected capacitor B6, and this moment, microwave output power was 236W;
When selecting three power shelves, high-voltage relay C10 disconnects, and high-voltage relay A8, high-voltage relay B9 closure are only connected capacitor A5 and capacitor B6, and this moment, microwave output power was 387W;
When selecting four power shelves, high-voltage relay A8, high-voltage relay B9 disconnect, and high-voltage relay C10 closure is only connected capacitor C7, and this moment, microwave output power was 480W;
When selecting five power shelves, high-voltage relay B9 disconnects, and high-voltage relay A8, high-voltage relay C10 closure are only connected capacitor A5 and capacitor C7, and this moment, microwave output power was 606W;
When selecting six power shelves, high-voltage relay A8 disconnects, and high-voltage relay B9, high-voltage relay C10 closure are only connected capacitor B6 and capacitor C7, and this moment, microwave output power was 684W;
When selecting seven power shelves, high-voltage relay A8, high-voltage relay B9, high-voltage relay C10 closure are connected capacitor A5, capacitor B6, capacitor C7, and this moment, microwave output power was 783W.
Be example with three power shelves now, it is as follows that its concrete working method is described in detail in detail:
After connecting alternating current, select three power shelves, high-voltage relay C10 disconnects, and high-voltage relay A8, high-voltage relay B9 closure are only connected capacitor A5 and capacitor B6, capacitor A5 and capacitor B6 parallel connection.Alternating current process band Filament Winding high-tension transformer 1 boosts, and the polarity of positive half cycle high-tension transformer 1 is last negative just down, and kenotron 3 is because of bearing the forward voltage conducting, and capacitor A5 and capacitor B6 charge, and magnetron is not worked; Negative half period is owing to just bearing down on the polarity of high-tension transformer 1, kenotron 3 ends because of bearing backward voltage, capacitor A5 and capacitor B6 parallel discharge, give magnetron 4 power supplies with band Filament Winding high-tension transformer 1 high pressure windings in series, magnetron 4 work, the output microwave, this moment, the power of micro-wave oven was 387W.When positive half cycle of the next one of alternating current and negative half period, magnetron is still worked in this way, the power output continous-stable.
The working method of other power shelves can repeat no more by that analogy.
Embodiment two
This example exists together mutually with embodiment's one, no longer is repeated in this description.Difference is: the capacitor volume ratio is 1: 2: ... 2
N-1Relation, that is: the capacity of capacitor A5 is 0.16 μ F, and the capacity of capacitor B6 is 0.32 μ F, and the capacity of capacitor C7 is 0.64 μ F.The length of moving spring armature group 15 is increased to 25mm.The transformer efficiency of micro-wave oven is 750W.
By the various combination of these three capacitors, can obtain seven kinds of microwave powers, seven power shelves can be provided.Through actual test, when selecting the different capacity shelves, the microwave power of respective electrical container situation in parallel, output is as shown in the table:
| The power shelves | Capacitor | Microwave power (W) |
| One | A | 106 |
| Two | B | 218 |
| Three | A∥B | 331 |
| Four | C | 444 |
| Five | A∥C | 557 |
| Six | B∥C | 670 |
| Seven | A∥B∥C | 790 |
Annotate: A ∥ C represents: capacitor A and capacitor C parallel connection, by that analogy.
In this example, the ratio of three capacitor volume is 1: 2: 4, and its seven kinds combinations in parallel have realized the even stepping that power is adjusted.
Concrete working method is identical with embodiment one, repeats no more.
Embodiment three
In the circuit of the magnetron high voltage source of micro-wave oven, four capacitors in parallel between band Filament Winding high-tension transformer 1 and kenotron 3, be respectively capacitor A5, capacitor B6, capacitor C7, capacitor D11, one end of each capacitor links to each other with band Filament Winding high-tension transformer 1 jointly, the other end is connected with high-voltage relay A8, high-voltage relay B9, high-voltage relay C10, high-voltage relay D12 respectively, and four high-voltage relays link to each other with kenotron 3 jointly.Each high-voltage relay all has two groups of moving contacts 13 and static contact 14, by moving spring armature group 15 two groups of contacts is connected; The length of moving spring armature group 15 is increased to 30mm.The opening and closing of the contact by controlling each high-voltage relay are adjusted the size of circuit total capacitance, thereby adjust microwave output power.
The capacity of capacitor A5 is 0.073 μ F, and the capacity of capacitor B6 is 0.146 μ F, and the capacity of capacitor C7 is 0.292 μ F, and the capacity of capacitor D11 is 0.584 μ F.The transformer efficiency of micro-wave oven is 850W.
By the various combination of these four capacitors, can obtain 15 kinds of microwave powers, 15 power shelves promptly can be provided at most.Through actual test, when selecting the different capacity shelves, the microwave power of respective electrical container situation in parallel, output is as shown in the table:
| The power shelves | Capacitor | Microwave power (W) |
| One | A | 84 |
| Two | B | 141 |
| Three | A∥B | 193 |
| Four | C | 245 |
| Five | A∥C | 304 |
| Six | B∥C | 356 |
| Seven | A∥B∥C | 407 |
| Eight | D | 457 |
| Nine | A∥D | 518 |
| Ten | B∥D | 570 |
| 11 | A∥B∥D | 622 |
| 12 | C∥D | 682 |
| 13 | A∥C∥D | 733 |
| 14 | B∥C∥D | 785 |
| 15 | A∥B∥C∥D | 844 |
Annotate: A ∥ C represents: capacitor A and capacitor C parallel connection, by that analogy.
In this example, the ratio of four capacitor volume is 1: 2: 4: 8, and its 15 kinds combinations in parallel have realized the even stepping that power is adjusted.
Concrete working method is identical with embodiment one, embodiment two, repeats no more.
Claims (4)
1. microwave oven with continuously adjustable power, comprise shell, fire door, furnace chamber, electric control chamber, band Filament Winding high-tension transformer (1), kenotron (3), magnetron (4), the parts that micro-wave ovens such as high voltage source possess usually, it is characterized in that: in the circuit of magnetron high voltage source, between band Filament Winding high-tension transformer (1) and kenotron (3) parallel connection n capacitor, n 〉=2 wherein, one end of each capacitor links to each other with band Filament Winding high-tension transformer (1) jointly, the other end is connected with a high-voltage relay separately, and n high-voltage relay links to each other with kenotron (3) jointly; The opening and closing of the contact by controlling each high-voltage relay are adjusted the size of circuit total capacitance, thereby adjust microwave output power.
2. the high-voltage relay in the microwave oven with continuously adjustable power as claimed in claim 1, the contact leading foot, base, coil, extension spring, shell, the coil leading foot that comprise general miniature electro-magnetic relay, it is characterized in that: this high-voltage relay has increased by one group of moving contact and static contact, have two groups of moving contacts (13) and static contact (14), two groups of contacts are connected by moving spring armature group (15); Length with moving spring armature group (15) is increased to 20～30mm simultaneously.
3. microwave oven with continuously adjustable power as claimed in claim 1 is characterized in that: n capacitor volume ratio is 1: 2: ... 2
N-1
4. as claim 1 or 3 described microwave oven with continuously adjustable power, it is characterized in that: n=3, that is: in the circuit of magnetron high voltage source, between band Filament Winding high-tension transformer (1) and kenotron (3) parallel connection three capacitors (5,6,7), one end of each capacitor links to each other with band Filament Winding high-tension transformer (1) jointly, the other end respectively with three high-voltage relays (8,9,10) in one connect, three high-voltage relays (8,9,10) link to each other with kenotron (3) jointly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200327753U CN2773505Y (en) | 2005-01-11 | 2005-01-11 | Microwave oven with continous adjustable power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200327753U CN2773505Y (en) | 2005-01-11 | 2005-01-11 | Microwave oven with continous adjustable power |
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| CN2773505Y true CN2773505Y (en) | 2006-04-19 |
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| CNU2005200327753U Expired - Fee Related CN2773505Y (en) | 2005-01-11 | 2005-01-11 | Microwave oven with continous adjustable power |
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| CN (1) | CN2773505Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101737827B (en) * | 2009-12-29 | 2011-09-07 | 厦门大学 | Double frequency conversion microwave oven having function of shimming fields |
| CN102200306A (en) * | 2011-05-19 | 2011-09-28 | 梁伟国 | Microwave oven |
| CN104034738A (en) * | 2014-06-24 | 2014-09-10 | 黑龙江工程学院 | Laboratory microwave deicing instrument |
| CN104764301A (en) * | 2015-04-23 | 2015-07-08 | 江南大学 | Microwave drying system capable of adjusting continuous linearity of output power |
-
2005
- 2005-01-11 CN CNU2005200327753U patent/CN2773505Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101737827B (en) * | 2009-12-29 | 2011-09-07 | 厦门大学 | Double frequency conversion microwave oven having function of shimming fields |
| CN102200306A (en) * | 2011-05-19 | 2011-09-28 | 梁伟国 | Microwave oven |
| CN104501231A (en) * | 2011-05-19 | 2015-04-08 | 梁伟国 | Microwave oven |
| CN104501229A (en) * | 2011-05-19 | 2015-04-08 | 梁伟国 | Microwave oven |
| CN104501231B (en) * | 2011-05-19 | 2016-09-07 | 梁伟国 | Micro-wave oven |
| CN104501229B (en) * | 2011-05-19 | 2016-09-07 | 梁伟国 | Micro-wave oven |
| CN104034738A (en) * | 2014-06-24 | 2014-09-10 | 黑龙江工程学院 | Laboratory microwave deicing instrument |
| CN104764301A (en) * | 2015-04-23 | 2015-07-08 | 江南大学 | Microwave drying system capable of adjusting continuous linearity of output power |
| CN104764301B (en) * | 2015-04-23 | 2016-10-26 | 江南大学 | A kind of adjustable microwave drying system of output continuously linear |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060419 Termination date: 20110111 |